Portable drilling machine



April 13, 1926. 1,580,655

' W. J. DAWSON PORTABLE DRILLING MACHINE Filed Jan. 28, 1925 Q/MM.

Patented Apr. 13, 1926.-

WILLIAM J. Dawson, or COLLBRAN, COLORADO.

PORTABLE nnrnrnv'enaonnvn.

7 Application filed January To all whom it may concern:

Be it known that 1, WILLIAM J. Dawson, a citizen of the United States, residing at (follbran, in the county of Mesa and State of Colorado, have invented certain new and useful Improvements in Portable Drilling Machines, of which the following is a speciii' cation.

My invention relates to improvements in portable drilling machines, and more particularly to that type known as feed drills. The machine, in operation, eliminates the usual manual application of pressure and manual support requisite of the present makes of portable drills now comma nly in use, and commonly found on the market.

An important object of the present invention is to provide a drill that will automatically feed the bit toward the work as the shaft of the drill is being rotated.

Another important object of the invention is to provide means whereby the bit may be fed toward the work ind pendently of the rotation of the shaft.

Another object of the invention is to provide a drill that may be attached to the work in a manner so as to dispense with the usual manual exertion, incident to machines of this nature now in common use.

A still further very important object of the invention is to generally improve upon portable drills, by providing a structure which, while strong and durable is, at the same t me, light and capable of being easily handled, and wherein all parts are accessible for repair and constantly in open view for inspection, one which is thoroughly reliable in operation, inexpensive to manufacture, not liable to readily get out of order, and well adapted to the purpose for which it is designed.

With the above and numerous other objQClZS in View, as will appear as the descrip tion proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts will be hereinafter more fully described and claimed.

In the drawing:

Figure 1 is a side elevation of my improved apparatus, with parts thereof in section.

Figure 2 is an enlarged detail perspective view of the bit retaining feature.

Referring to the drawing in detail, it will be seen that 1 denotes a frame comprising erial No. 5278.

two or more parallel strips preferably of a light metal, internally connected at one end by an internally threaded annulus 2, and at their opposite ends by a plate 3. An eaten nally threaded elongated sleeve 3 is threaded through the internally threaded annulus 2, and is provided with a head it, for the purpose of ca :rying a pivoted lever A crank arm 6, having a knob 7, is employed to actuate a shaft joarnaled through alsleeve 3. A, bit receiving shank 9 fits over the er:- treinity of the shaft 8, and is secured thereto by a set screw 10. A- pin 11 extends through the bit receiving shank 9 and carries at each end the respective :ztremity of the U-shaped bracket 12. This pin is provided intermediate its ends with a notch 15, conforming in shape to the bit head shapes of standard makes. A notch '13 is provided in one side edge of the intermediate portion of the bracket 12, for the purpose oi receiving the shank of the bit it, under the head there of, and tends to retain this bit in proper engagement with the bit receiving shank 9, since the enga 'ement of the head of the bit with the pin 11 at its notch 15 tends to prevent rotation of the pin, thereby tending to prevent the intermediate portion of the bracket 12 from swinging away from the shank of the bit 1 W hen the bracket 12 is manually swung away from the bit 1%, the rotation of the pin caused thereby tends to push the head the bit out of the bit receivingshank 9. A washer 16 spaces the bit receiving shank from frictional contact with a reciprocatory guide block carried by the shaft 8, and in which the shaft 8 s free to rotate. This block is grooved, at its periphery for receiving the strips of the frame 1, thereby acting as a guide for the shaft and the bit associated therewith. A flanged collar 18 is secured to the shaft 8, and rotatable therewith. A plurality of washers are supported on the flanged side of the collar 18, as at 19, to separate this flanged collar, from direct frictional engagement with the threaded sleeve 3, and thereby providing; added bearing surfaces ihat will prevent the destructive wear of major parts of the apparatus.

It will be seen that when the lever 5 is swung from the position shown in Figure 1, over toward the shaft 8, it will rest in the path of the crank 6, and as this crank is rotated, it will engage the lever 5, cansing the rotation of the sleeve3 with the shaft, thus feeding the bit toward the work while it 15 being rotated. When the lever 5 is disposed, as shown in Figure 1, the

sleeve 3 may be rotated independently of the shaft 8, and the bit fed toward the Work independently of the rotation of'the' shaft 8, as may be desired. The bit 14 is adapted to be fed through a bit guide 20, which is retained in position by a pin 21, which pro jects through the fame strips and extends into the surface of the bit guide being held in place by springs A link 2st loosely connects a turn buckle 25 and fastener 26 to one end of the plate 3, and a chain 27 is engaged with the other.

end of the plate, so that itmay be disposed,

about the object to be worked upon and engaged with the fastener 26, in order that the.

plate is held in proper position thereon. It will be apparent from the above that I have devised a very simple and efficient. portable drill appa'atus, which GilllOOdlBS parting from the spirit or scope of the invention as hereinafter claimed, or sacrificing any of its advantages.

Having'thus described my invention, what I claim as new is:

A portable drill of the character described comprising a frame, a sleeve threadedly mounted in the frame and provided with an enlarged head at its outercxtren'iity, a shaft rotatably mounted in the sleeve and provided with a bit receivin socket at one end, andvan offset portion at its other end, a lever pivoted to the enlarged head on the sleeve and adapted to interlock with the off set portion;ofthe shaft for, causing a simultaneous rotation, and feeding of the shaft in respectto the frame, a guit e block slid able in the frame, said frame being provided with a pair of guides engageable by said block, said shaft passing through said guide block, a collar on the shaft engageable with said guide block, and holding the same in engagement with, the bit receiving socket end, the, inner end of said sleeve adapted to abut said collar.

In testimony whereof I afiix my signature.

\VILLIAH J. DAlVS-ON. 

